Table 2.

Assessment of the included studies using the GRADE scale

Author / Year	Risk of bias	Imprecision	Inconsistency	Indirectness	Publication Bias
Murbay et al. [18]	Very low	Very low	Very low	Very low	Very low
Dwisaptarini et al. [19]	Very low	Very low	Very low	Very low	Very low
Pulijala et al. [20]	Very low	Very low	Very low	Very low	Very low
Tubelo et al. [21]	Very low	Very low	Very low	Very low	Very low
Samuel koo et al. [22]	Very low	Very low	Very low	Very low	Very low
Hirono Kikuchi et al. [23]	Very low	Very low	Very low	Very low	Very low
Riki Gottlieb et al. [24]	Very low	Very low	Very low	Very low	Very low
Nardy Casap et al. [25]	Very low	Very low	Very low	Very low	Very low
Suebnukarn et al. [26]	Very low	Very low	Very low	Very low	Very low
Buchanan et al. [27]	Very low	Very low	Very low	Very low	Very low
Al-Saud et al. [28]	Very low	Very low	Very low	Very low	Very low
Liebermann et al. [14]	Very low	Very low	Very low	Very low	Very low
Zhang et al. [29]	Very low	Very low	Very low	Very low	Very low
Siah Mansoory et al. [13]	Very low	Very low	Very low	Very low	Very low